When society collapses and the power grid fails, you’ll always be able to keep your phone charged with twigs and branches if you buy BioLite’s CampStove 2 for 25% off today.

It sounds like fake news, but this thing really does work. You just find some sticks just laying on the ground, toss them into the stove and press a button to light them on fire. Then, you plug your phone into the USB port on the side of the stove, which is connected to a battery that is recharged by the flames. It’s completely bonkers, and yet it works.

Of course, this also works as a regular old camp stove, and at full power it can boil a liter of water in under five minutes. It’s also super light, and is about the size of a large water bottle, so it won’t take up too much space in your camping bag. Save over $30 on it today with promo code BioLite2, which brings it below $100 for the first time ever.

BioLite’s BaseLanterns is also on sale with the same code today. It puts out enough light to illuminate your entire campsite, and you can also plug in SiteLites from BioLite’s NanoGrid for even more illumination.